Skip to main content Accessibility help
×
Home

Magnetic Hardening Induced by Exchange Coupling in Mechanically Milled Antiferromagnetic - Ferromagnetic Composites

  • J. Sort (a1), J. Nogués (a1), X. Amils (a1), S. Suriñach (a1), J.S. Muñoz (a1) and M.D. Baró (a1)...

Abstract

Mechanical milling has been used to synthesize ferromagnetic (FM, Co) - antiferromagnetic (AFM, NiO) composites. The coercivity, HC, and energy product, BHMax, of these composites can be enhanced at room temperature after appropriate heat treatments above the Néel temperature of the AFM, TN. Although the maximum Hc is achieved for the (NiO)1: 1 (Co) weight ratio, BHMax is further enhanced for the (NiO)2:3(Co) ratio, where higher saturation magnetization is obtained due to the larger amount of FM. Exchange coupling, responsible for these effects, decreases as the temperature is increased and vanishes close to TN. The thermal stability of the coercivity enhancement remains rather insensitive to the somewhat broad distribution of blocking temperatures of this system.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Magnetic Hardening Induced by Exchange Coupling in Mechanically Milled Antiferromagnetic - Ferromagnetic Composites
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Magnetic Hardening Induced by Exchange Coupling in Mechanically Milled Antiferromagnetic - Ferromagnetic Composites
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Magnetic Hardening Induced by Exchange Coupling in Mechanically Milled Antiferromagnetic - Ferromagnetic Composites
      Available formats
      ×

Copyright

References

Hide All
1. Benjamin, J. S., Metall. Trans. 1, 2943 (1970); Mater. Sci. Forum 88-90, 1 (1992).
2.For a review, see Murty, B. S. and Ranganathan, S., Inter. Mater. Rev. 43, 101 (1998).
3.For a review, see Siegel, R. W., Nanostruct. Mater. 3, 1 (1993).
4. McCormick, P. G., Miao, W. R., Smith, P. A. I., Ding, J., Street, R., J. Appl. Phys. 83, 6256 (1998).
5. Raviprasad, K., Runakoshi, M. and Umemoto, M., J. Appl. Phys. 83, 921 (1998).
6. Fargan, A. J., Viret, M. and Coey, J. M. D., J. Phys: Cond. Matter. 7, 8953 (1998).
7. Geoghegan, D. S., McCormick, P. G. and Street, R., Mat. Sci. Forum 179–181, 629 (1995).
8. Meiklejohn, W. H. and Bean, C. P., Phys. Rev. 102, 1413 (1956); 105, 904 (1957).
9.For a review, see Nogués, J. and Schuller, Ivan K., J. Magn. Magn. Mater. 192, 203 (1999).
10. Edelstein, A. S., Kodama, R. H., Miller, M., Browning, V., Lubitz, P., Cheng, S. F. and Sieber, H., Appl. Phys. Lett. 74, 3872 (1999); Y. J. Tsang, B. Roos, T. Mewes, S. O. Demokritov, B. Hillebrands and Y. J. Wang, Appl. Phys. Lett. 75, 707 (1999).
11. Sort, J., Nogués, J., Amils, X., Suriñach, S., Muñoz, J. S. and Baró, M. D., Mater. Sci. Forum (2000) in press.
12. Huang, J. Y., Wu, Y. K. and Ye, H. Q., Appl. Phys. Lett. 66, 308 (1995); F. Cardellini and G. Mazzone, Philos. Mag. A 67, 1289 (1993).
13. Sort, J., Nogués, J., Amils, X., Surifiach, S., Muftoz, J. S. and Baró, M. D., Appl. Phys. Lett. 75, 3177 (1999).
14. Sato, H., Kitakami, O., Sakurai, T., Shimada, Y., Otani, Y. and Fukamichi, K., J. Appl. Phys. 81, 1858 (1997).
15. Soeya, S., Imagawa, T., Mitsuoka, K. and Narishige, S., J. Appl. Phys. 76, 5356 (1994); C. Tsang and Kenneth Lee, J. Appl. Phys. 53, 2605 (1982).

Magnetic Hardening Induced by Exchange Coupling in Mechanically Milled Antiferromagnetic - Ferromagnetic Composites

  • J. Sort (a1), J. Nogués (a1), X. Amils (a1), S. Suriñach (a1), J.S. Muñoz (a1) and M.D. Baró (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed